Fuel-feeding device



(No Model.) A2 sheets-sheet 1.

J. DAVIES.

FUEL EEEDING DEVICE. I No. 524,579. Patented Aug. 14 1894.

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Patented Aug. 14, 1894.

(No Model.)

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WITNESSES @25g/.4W @44AM/@6422@ UNITED STATES PATENT EEICE.

JOSEPH DAVIES, OF BRIDGEPORT, PENNSYLVANIA.

FU El..-FEEDING DEVICE.

SPECIFICATION forming part of Letters Patent No. 524,579, dated August14, 1894.

Application iiled January 29, 1894. Serial No. 498,298. (No model.)

To a/ZZ whom it may concern:

t Be it known that I, JOSEPH DAvIEs, a citizen of the United States, anda resident of Bridgeport, Montgomery county, Pennsylvania, have inventedcertain Improvements in Fuel-Feeding Devices for Furnaces, of which thefollowing is a specification.

The object of my invention is to construct an efficient form ofautomatic stoker for furnaces in which the fuel, in powdered or negranular form, is forced into the lire box and distributed throughoutthe area of the grate, provision being also made for withdrawingunconsumed products of combustion from the smoke box and conveying theminto the fire box with the fresh fuel.

In the accompanying drawingsz-Figure 1, is a view partly in section andpartly in elevation, of a steam boiler furnace provided with automaticfuel-feeding devices in accordance with my invention. Fig. 2, is anenlarged sectional view of the fuel-feeding device detached from thefurnace. Fig. 3, is

a front view on the same scale as Fig. l; and

Fig. L.his a perspective view of part of the de- Vice. v t

Arepresents the fire box of the furnace, A the grate, A2 the bridgewall, B the front plate, B the front arch, D the boiler, a the usualfire doors, a the ash pit doors and a2 the smoke box doors in front oftheboiler dues.

Suitably mounted upon the front plate of the furnace is the automaticfue] feeding device, which consists of the hopper F, a measuring box G,a conveyer pipe I and a distributer pipe J, these parts beingconstructed and operated as follows:

The hopper F has in the lower portion a toothed crushing or breakingroll ZJ which, in the case of bituminous coal or fuel in large lumps,serves toreduce the same to pieces of the proper size before permittingthem to pass through the neck d into the measuring box G which containsav rotary measuring valve f having opposite pockets, which, as saidvalve is rotated, alternately receive the fine coal from the hopper anddischarge it into the t conveyor pipe I which is curved forward at veyerpipe I and discharging into the front end 0f the distributer pipe J is anozzle m which is supplied with superheatcd steam from any availablesource, vthe jet from the nozzle serving to forcibly propel or dischargeinto the fire box the fine granular fuel delivered to the conveyer pipeby the measuring valve f.

A pipe K leads from the upper portion of the conveyor ppeI to the smokeboxMof the furnace so that the draft caused by the action of the jetfrom the nozzle fm serves to induce unconsumed products of combustionfrom the smoke box to iow through said pipe K and into the conveyorpipe, from which they are forced with the fresh fuel into the fire box,to be there ignited and consumed.

The distributor pipe J is out away at its inner end so as to leave twoprojecting lingers n and to these fingers is pivoted a detiector blade Pagainst whichthe fine granular fuel forced through the pipe J impingesand is thereby scattered in a broad, thin sheet into the fire box, thedeflector blade being adjustable so that its angle may be changed andthe distribution of the fuel in the fire box regulated, thus, the nearerthe angle of the blade approaches a right angle in respect to the axialline of the pipe, the closer will the fuel be confined to the front ofthe iire box, and the more nearly the angle of the blade approachesparallelism with the pipe, the further will the fuel be thrown towardthe rear of the fire box. Suitable nuts on the ends of the pivot shaftof the blade P serve to secure the same in any desired position ofadjustment.

The shaft of the Crusher b has at one end a spur wheel la which mesheswith a pinion 7c on a shaft s located in the rear of the measuring boxG, and having a worm s which meshes with a worm wheel s2 on the shaft ofthe measuring valve, so as to drive the same at the desired reducedspeed. The

' shaft of the measuring valve is also provided with a sprocket wheel wwhich receives a IOC chain w', the latter being also adapted to aAsprocket wheel @U2 ou the distributing pipe J, so as to effect therotation ot' the same and insure thescattering of the granular fuelVthroughout the fire box.

When it is desired to render the device automatic in its action, theoperation of the shaft of the crusher b can be governed by the usualdamper regulator, so that when the pressure of steam reaches apreeileteiz'minedk point the rotation of said shaft will be stopped, andthe further feeding of fuel to the fire box will be arrested until thepressure is re-4 duced.

The joint between the hopper F and the neck d isso located that, whensaid hopper is removed, the smoke box doors a? can be readily opened inorder to gain access to the smoke box tlues and man-hole of the boilerIwithout disturbing any of the operative parts of the apparatus.

The above described apparatus provides for the use of coal in very smallgrains and thus p opens a market for many thousands of tons of coalwhich are now regarded as waste, while owing to the small size of eachunit of fuel, and to the thorough distribution of the fuel throughoutthe entire fire'box, very effective combustion of thefuel is insured sothat, in connection with the provision for returning to the fire boxsuch uuconsumed products of combustion as may find their way to thejsmoke box, the device inits operation is prac- 1 tically smokeless. j

Although I prefer to use a jet of superheated steam as a means forforcing the fuel through the distributer, a jet of air, under sufficientpressure, and preferablyYV heated,f may be substituted therefor, ifdesired.

Having thus described my invention, Iv claim and desire to secure byLetters Patent- 1. The combination in fuel feeding devices for furnaces,of a fuel conveyer, a distributer"A pipe forming a continuation of thesame and projecting into the furnace, the inner end of said pipe beingcut away at opposite points so as to form projecting fingers, meanswhereby the fuel is forced through the conveyenpipe; and into andthrough the distributer pipe,j` and an inclined deflector plate hung tothe' projecting fingers at the inner end of Vthedistributer pipefandextending across said pipe, substantially as specified. Y

2. The combination, in fuel feeding devices for furnaces, of a fuelconveyer pipe, a distribnter pipe forming a continuation of saidconveyer pipe and projecting into the fire box,

a deflectorat the inner end of said distributer pipe, means for rotatingsaid pipe, and means for forcing the fuel from said conveyer pipe intoand through the distributer pipe, substantially as specified. I

3. The combination, in fuel feeding devices for furnaces, of a fuel/conveyer, a fuel distributer forming a continuation of said conveyer andproj ectingintofthetire box, means whereby the fuel is forced from theconveyerA 4box having a rotary valve, a conveyer pipe communicating withsaid measuring box, a distributing pipe forming a continuation of 4saidconveyer pipe and projecting into the furnace, a deflector at the innerend of said v'distributing pipe, and a jet nozzle discharg- Iing intothe forward end of the pipe, substantially as specified.

5. The combination in fuel feeding devices -for furnaces, of theconveyer pipe h aving a forcing jet nozzle, a `rotary distributer pipe,a measuringboxrhaving a rotary valve, afeed hopper having a rotarycrusher, a shaft having a worm meshing with aworm wheel on `lthe valveshaft, gearing connecting said worm lshaft and the shaft of the crusher,and gearing whereby the rotary distributer pipe is driven from the shaftof the measuring valve, substantially as specified.

In testimony whereof I have signed my 4name te this specication in thepresence of two subscribing witnesses.

JOSEPH DAVIES. Witnesses:

WILLIAM A. BARR, JOSEPH H. KLEIN.

